Bilzen weather in May

In May, Bilzen sees average daytime highs of 18°C and overnight lows near 9°C, with 63 mm of rain across 12.7 wet days and about 15.2 hours of daylight. It is the 5th-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 16°C in the first days to 19°C by the end. The sky is clear or mostly clear about 17% of the time in May, and the air most often feels dry.

Daylight stretches from about 14 h 30 min at the start of May to 15 h 54 min by month's end. Set against the rest of the year, May is Bilzen's 6th-clearest and 9th-windiest month. For the whole year in context, see Bilzen's year-round climate.

Daytime high
18°
5th warmest
Overnight low
8th coldest
Rainfall
63 mm
12.7 wet days
Daylight
15 h 18 min
4:56 AM – 8:13 PM
Cloud cover
69%
6th clearest
Wind
12 km/h
9th windiest
Solar energy
5.03 kWh/m²
Travel score
5.3
out of 10

Bilzen is town in Bilzen municipality, Belgium.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 16°C in the first days to 19°C by the end.

A typical May day in Bilzen reaches about 18°C in the afternoon and slips back to 9°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 24°C. Set against its neighbours, May runs about 4°C warmer than April and about 3°C cooler than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
1167
2168
3168
4178
5178
6178
7178
8178
9178
10178
11178
12179
13179
14189
15189
16189
17189
18189
19189
20189
211810
221910
231910
241910
251910
261910
271910
281910
291911
302011
312011

How May really feels in Bilzen

Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Bilzen weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 701328.20.2
Feb / 63122.99.70.5
Mar10° / 6413.21.211.52.1
Apr14° / 5211.20.113.53.9
May18° / 6312.7015.25.3
Jun21° / 12°7412.7016.25.8
Jul23° / 14°7812.9015.86.3
Aug22° / 14°7912.3014.36.3
Sep19° / 11°6210.8012.45.8
Oct14° / 6311.8010.43.9
Nov / 6712.60.58.71.7
Dec / 82142.67.80.4

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 13% of May, with mostly cloudy or overcast conditions the remaining 70%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13070
23070
33070
43070
53169
63169
73070
83070
93070
103070
113169
123169
133169
143169
153070
163070
173169
183070
193070
203070
213169
223169
233169
243070
253169
263169
273169
283169
293169
303169
313169

Chance of precipitation in May

Any precipitation

Bilzen gets around 63 mm of rain over 12.7 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 44% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
143
243
342
442
542
641
741
841
940
1040
1140
1240
1340
1440
1540
1640
1741
1841
1941
2041
2141
2241
2342
2442
2542
2642
2742
2842
2943
3043
3144

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the dry band about 91% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19910
29820
39820
49730
59730
69730
79640
89640
99640
109550
119550
129550
139460
149460
159460
169370
179370
189280
199181
209091
219091
2288102
2387112
2486122
2584133
2683143
2781154
2880164
2978175
3077185
3176186

Wind in May

Winds average 12 km/h in May.

Across May, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712calm
2812calm
2912calm
3012calm
3112calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 14 h 30 min at the start of May to 15 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 84 minutes over May. Sunrise moves from 5:21 AM to 4:38 AM, and sunset from 7:49 PM to 8:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.55:217:49
214.55:197:51
314.65:177:53
414.65:157:54
514.75:147:56
614.85:127:57
714.85:107:59
814.95:088:00
914.95:078:02
1015.05:058:04
1115.05:038:05
1215.15:028:07
1315.15:008:08
1415.24:598:10
1515.24:578:11
1615.34:568:13
1715.34:548:14
1815.44:538:16
1915.44:518:17
2015.54:508:18
2115.54:498:20
2215.64:488:21
2315.64:468:23
2415.64:458:24
2515.74:448:25
2615.74:438:26
2715.84:428:28
2815.84:418:29
2915.84:408:30
3015.94:398:31
3115.94:388:32

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.03 kWh/m².

For context, solar energy here swings from a low near 0.64 kWh/m² to a high of 5.31 kWh/m² in June across the year — May's 5.03 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in May

Is May a good time to visit Bilzen?

Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.3
Sightseeing
5th-best month of the year
1.7
Beach & pool
5th-best month of the year

May is a reasonable time to visit Bilzen for sightseeing.

What to pack for Bilzen in May

From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In May, Bilzen sees daytime highs around 18°C and nights near 9°C. Worth packing: rain gear and sun protection. About 13 days see rain.

rain gearsun protection

UV index in Bilzen in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bilzen peaks around July 13 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 13UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul7High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Bilzen in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in Bilzen is worst in April — around 16 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1216 µg/m³Dec 1311 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb12Moderate
Mar16Moderate
Apr16Moderate
May15Moderate
Jun14Moderate
Jul13Moderate
Aug14Moderate
Sep13Moderate
Oct12Good
Nov11Good
Dec11Good
Location & terrain

Where is Bilzen?

Bilzen sits at 50.9°N, 5.5°E, 53 m above sea level, in Belgium. The nearest listed city is Diepenbeek, 8.0 km away.

Mechelen-aan-de-Maas

Topography around Bilzen

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Bilzen.

Within 3 km, the terrain around Bilzen has only modest variations in elevation — a maximum elevation change of 71 m around an average of 64 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 148 m; within 80 km, large variations in elevation — a maximum elevation change of 992 m.

The land around Bilzen is covered by trees (33%), grassland (27%) and cropland (20%) within 3 km, trees (36%), cropland (25%) and grassland (21%) within 16 km, and trees (38%), cropland (28%) and grassland (24%) within 80 km.

3 km
71 m
16 km
148 m
80 km
992 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Diepenbeek 8.0 km · Riemst 9.0 km · Lanaken 9.0 km · Genk 10 km · Tongeren 11 km · Maastricht 12 km · Hasselt 14 km · Mechelen-aan-de-Maas 16 km

Belgium travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 81% of US
price level, 2025
GDP per capita
$60,750
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2021
Road deaths
5.8
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 608
Religion
Roman Catholic 57%nonbeliever/agnostic 20%atheist 9%Muslim 7%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Bilzen (50.8732°, 5.5184°, elevation 53 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).